What is blood pressure

The word blood pressure should not be unfamiliar to all of us, because we often hear people mention the word blood pressure in our lives. But in fact, there are relatively few people who really understand blood pressure, because strictly speaking, blood pressure is a more professional term, and we ordinary people generally only know about some blood pressure diseases, and we don’t know much about the real blood pressure.

So what is blood pressure? When asked this question, many people often don't know how to answer it, because blood pressure is an academic term, and the people who really understand blood pressure are generally scholars or experts in related professions. Apart from that, few people know the true definition of blood pressure. So, let’s talk about the issue of blood pressure.

Blood pressure is the pressure exerted on the blood vessel walls when blood flows in the blood vessels. It is the driving force that pushes blood to flow in the blood vessels. When the ventricles contract, blood flows from the ventricles into the arteries. At this time, the pressure of blood on the arteries is the highest, which is called systolic blood pressure (SBP). The ventricle relaxes, the elasticity of the arteries shrinks, and the blood continues to flow forward slowly, but the blood pressure drops. The pressure at this time is called diastolic blood pressure (DBP).

The human body's circulatory organs include the heart, blood vessels and lymphatic system, which are interconnected to form a basically closed "pipeline system". A normal heart is a powerful muscular organ that beats rhythmically day and night, like a pump. The heart contracts and expands, keeping blood flowing through the circulatory organs. When blood flows in the blood vessels, whether the heart contracts or relaxes, it exerts a certain pressure on the blood vessel walls. When the heart contracts, the pressure in the aorta is highest, and the blood at this time is called "high pressure"; when the left ventricle relaxes, the pressure in the aorta is lowest, so it is called "low pressure". What we usually call "blood pressure" actually refers to the blood pressure measurement of the brachial artery in the upper arm, that is, the blood pressure of the blood vessels in the armpit, which is an indirect measurement of the blood pressure in the large arteries. Usually when we measure blood pressure, the blood pressure on the right side and the left side are different. The maximum difference can be 10 mmHg and the minimum difference is less than 5 mmHg.

Normal blood pressure is a prerequisite for blood circulation. Blood pressure remains normal under the regulation of multiple factors, thereby providing various tissues and organs with sufficient blood to maintain normal metabolism. Blood pressure that is too low or too high (hypotension, hypertension) can cause serious consequences, and the disappearance of blood pressure is a precursor to death. This shows that blood pressure has extremely important biological significance.

To sum up, I believe everyone should understand the true definition of blood pressure. In fact, blood pressure refers to the pressure of blood pressure on blood vessel walls. It is a technical term. After understanding blood pressure, we should have a deeper understanding of some common blood pressure diseases in the human body, so as to prevent ourselves from suffering from blood pressure diseases from the root.